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Title:
DIAPHRAGM CONTROL APPARATUS OF INTERCHANGEABLE LENS CAMERA
Document Type and Number:
Japanese Patent JP2013190751
Kind Code:
A
Abstract:

To precisely determine an origin position of a diaphragm control rod in a short time by suppressing a bound amount when the diaphragm control rod reaches a first end in initialization processing.

Control means 45 is configured to: perform a high-speed step driving of a diaphragm control rod 57 toward a first end via a stepping motor 53 when an initialization processing command signal is input; allow position detection means 64 and 65 to detect a position when the diaphragm control rod 57 reaches the first end and is bounded; store the detected position as a provisional origin position; after the bound, perform a slow-speed step driving of the diaphragm control rod 57 toward the first end via the stepping motor 53 while allowing the position detection means 64 and 65 to compare a current position of the diaphragm control rod 57 with the provisional origin position; and determine a position when the position of the diaphragm control rod 57 detected by the position detection means 64 and 65 comes within a predetermined range of the provisional origin position as an origin position.


Inventors:
YAMADA TOSHIAKI
Application Number:
JP2012058688A
Publication Date:
September 26, 2013
Filing Date:
March 15, 2012
Export Citation:
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Assignee:
PENTAX RICOH IMAGING CO LTD
International Classes:
G03B9/02; G03B9/06; G03B17/14
Domestic Patent References:
JP2008197552A2008-08-28
JPH0277732A1990-03-16
JP2011028241A2011-02-10
JP2011028243A2011-02-10
JP2010197960A2010-09-09
JP2005107173A2005-04-21
JPH02123336A1990-05-10
JP2011028242A2011-02-10
JP2009216994A2009-09-24
JPS5517141A1980-02-06
JP2008122827A2008-05-29
JP2006003618A2006-01-05
JPS6129824A1986-02-10
JP2008197552A2008-08-28
JPH0277732A1990-03-16
JP2011028241A2011-02-10
JP2011028243A2011-02-10
JP2010197960A2010-09-09
JP2005107173A2005-04-21
JPH02123336A1990-05-10
JP2011028242A2011-02-10
JP2009216994A2009-09-24
JPS5517141A1980-02-06
JP2008122827A2008-05-29
JP2006003618A2006-01-05
JPS6129824A1986-02-10
Attorney, Agent or Firm:
Kunio Miura
Daisuke Ando
Kuniyo Miura



 
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